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Pig Frog (Rana grylio)
A pig frog's gender can be determined by the size of its circular tympanic membrane (outer ear). The tympanic membrane will usually be larger than the eye in males and usually the same size or smaller than the eye in females.
Pig frogs look similar to bull frogs. To distinguish between the two, look for the pig frog's hind-feet webbing that extends almost to the tip of its toes.
U.S. Department of the Interior, U.S. Geological Survey, Center for Coastal Geology
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